Measurements of the pressure distribution on the horizontal-tail surface of a typical propeller-driven pursuit airplane in flight I: effects of compressibility in steady straight and accelerated flight Page: 4 of 78
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NACA TN No. 114 3
cyc section load -modulus, feet
d propeller diameter, feet
D wing drag, pounds
H free-stream total pressure
hp pressure altitude, feet
t tail length distancee from airplane c.g. to one-third maximum chord
poitt of tail), feet
M free-'strean Mach number
M1 pitching moment (stalling moment is positive), foot-pounds
M2 torsional moment on fuselage due to horizontal-tail:loading (posl-
tive when moment is clockwise as seen from rear), pound-feet
Nt ":air 'load. oft'horizontal tail (positive when load. is acting upward),
p free-stream static pressure
p0 standard atmospheric pressure at sea level . :
p3 pressure on lower surface, pounds per. square foot
Pu pressure on upper surface, pounds per square foot
PRES resultant pressure coefficient, [(p - Pu)/q]
q free-stream dynamic pressure, pounds per saiare foot
8 horizontal-surface area, square peet
T propeller tbrust,"pouds '' -
V true airspeed, miles per hour
Vi correct indicated airspeed, miles }br hour
W average airplane weight during test run, pounds
x horizontal distance from center of gravity to aerodynamic center of
wing (positive when c.g. is aft of a.c. of wing), percent M.A.C.
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Sadoff, Melvin; Turner, William N. & Clousing, Lawrence A. Measurements of the pressure distribution on the horizontal-tail surface of a typical propeller-driven pursuit airplane in flight I: effects of compressibility in steady straight and accelerated flight, report, July 1947; (digital.library.unt.edu/ark:/67531/metadc55030/m1/4/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.